feat(iOS, Stack): update back button configuration logic to handle iOS 26 and fix other problems

android/src/main/java/com/swmansion/rnscreens/ScreenStackHeaderConfigViewManager.kt

@@ -313,6 +313,13 @@ class ScreenStackHeaderConfigViewManager :
         logNotAvailable("backButtonDisplayMode")
     }
 
+    override fun setBackButtonUseModernImplementation(
+        view: ScreenStackHeaderConfig?,
+        value: Boolean,
+    ) {
+        logNotAvailable("backButtonUseModernImplementation")
+    }
+
     override fun setBlurEffect(
         view: ScreenStackHeaderConfig?,
         value: String?,

android/src/paper/java/com/facebook/react/viewmanagers/RNSScreenStackHeaderConfigManagerDelegate.java

@@ -97,6 +97,9 @@ public void setProperty(T view, String propName, @Nullable Object value) {
       case "backButtonDisplayMode":
         mViewManager.setBackButtonDisplayMode(view, (String) value);
         break;
+      case "backButtonUseModernImplementation":
+        mViewManager.setBackButtonUseModernImplementation(view, value == null ? false : (boolean) value);
+        break;
       case "hideBackButton":
         mViewManager.setHideBackButton(view, value == null ? false : (boolean) value);
         break;

android/src/paper/java/com/facebook/react/viewmanagers/RNSScreenStackHeaderConfigManagerInterface.java

@@ -39,6 +39,7 @@ public interface RNSScreenStackHeaderConfigManagerInterface<T extends View>  {
   void setTitleColor(T view, @Nullable Integer value);
   void setDisableBackButtonMenu(T view, boolean value);
   void setBackButtonDisplayMode(T view, @Nullable String value);
+  void setBackButtonUseModernImplementation(T view, boolean value);
   void setHideBackButton(T view, boolean value);
   void setBackButtonInCustomView(T view, boolean value);
   void setBlurEffect(T view, @Nullable String value);